request: print whole page

[dyoo]

Request from a Stack Overflow user: provide ability to print source code. http://stackoverflow.com/questions/9346711/how-to-print-wescheme-programs

[schanzer]

This is tricky, since CodeMirror never actually renders the entire program (if it did, we could just change the CSS).We'll have to detect print events programmatically.

There's a cross-browser javascript solution for detecting printEvents here: http://tjvantoll.com/2012/06/15/detecting-print-requests-with-javascript/

All we need to do is add a

node, and fill it with the program contents. Then we can use CSS to make sure that the only thing ever printed is div#print.